We are currently finishing off our attic, which has never been finished. We have never let our cat in the attic ever because of the fiber glass insulation and open spots in the floor. Since we have removed all insulation and patched all holes in the floor I let my cat in the attic while supervised for the first time. After he got comfortable with his new environment I caught him looking like he was thinking about jumping up on the walls around our stairs going to the attic (see pic below). Obviously if he fell it would be really bad. He is a fantastic climber and very adventurous cat and I know he will try this again. Any thoughts on how I can avoid having him jump up on the walls around the stairs?